Light and oxygenic photosynthesis: energy dissipation as …
Anoxygenic photosynthesis - an overview | ScienceDirect …
The high quality LED lights do not have as much of the heat problems of Metal Halide & even fluorescent lights (via ballasts), often last 50,000 hours, and some (in high-end aquarium LED adjusted configurations), and are very compact.
In fact this lower use of much of the yellow/green light (as a percentage) often makes some "high-end" LEDs look less bright to the human eye, when in fact the opposite is true as per useful light energy (PUR).
Anoxygenic photosynthesis uses energy from ..
The newer Halogen Quartz Iodide (HQI) lighting systems are used mostly on saltwater reef aquariums. HQI bulbs are commonly offered with spectrums of 10,000K and 20,000K. These high-intensity bulbs help corals thrive, but give off less heat than regular metal halide bulbs. HQI Double Ended Metal Halide bulbs have been used in Europe for many years have gained popularity in the U.S. among aquarium hobbyists in the last several years.
Double Ended MH HQI bulbs offer many of the same features as standard mogul base Metal Halide bulbs but are designed differently. These bulbs are much smaller than mogul base screw in Metal Halides and are double ended.
The benefits of using HQI Metal Halide bulbs are that they offer a more clean color spectrum (useful light energy/responsive wavelength), are more efficient, produce slightly less heat, and last longer than standard Mogul Base metal halide lamps.
Oxygenic Photosynthesis — Light ..
An example of a new emitter developed just for photosynthetically sensitive reef inhabitants is the 'Osram Olson NP Blue'. This patented emitter primarily targets the FULL spectrum of blue necessary for phototropic response, as well it also contains light energy in the full spectrum of PAR, unlike other blue emitters that have come before it.
Light Absorption for Photosynthesis
Since LEDs emit light only in a very specific direction, the installer also has the option to illuminate a precise area using lenses in specific degrees of angle.
For this reason the LED does not need to produce as many lumens/photons of light as most conventional lights. In conventional lights, many lumens of important light energy are lost due to lack of focus, including all power compacts and fluorescent lights in general, but need higher lumen outputs to achieve the same lighting parameters.